keep up the fight. >>> up next, president obama got great reviews saturday night at the white house correspondents' dinner. behind the laughs as always with humor was political truth, at least from the mouth or brain of the person talking. this was great because he got shots off the other night of people he didn't like too much. this is "hardball,". the place for politics. >>> catch this. senators who voted no on that background check vote are suffering in the polls. look at this. last week we told you how new hampshire republican kelly ayotte has slid 15 points in a new ppp poll. she's hardly alone now. look at this. arizona's jeff flake has become the most unpopular senator in the country since voting against background checks. he's at 32% approval in arizona. a republican. versus 51% disapproval, again, in arizona. up in alaska, lisa murkowski's no vote cost her as well. back in february she was among the most popular senators. now her approval is under 50% with almost as many disapproving as approving. now in ohio, rob portman, couldn't believe this, has lost a net of 18 points. he's now at 26